discovery: properly set the isRemote field for validated networkMsg

This wasn't set properly, leading to some test failures after the prior
change.

discovery/gossiper.go

@@ -1182,7 +1182,7 @@ func (d *AuthenticatedGossiper) sendBatch(annBatch []msgWithSenders,
 	isLocal bool) {
 
 	// If this is a batch of announcements created locally, then we can
-	// skip the filter and deup logic below, and just send the
+	// skip the filter and dedup logic below, and just send the
 	// announcements out to all our coonnected peers.
 	if isLocal {
 		msgsToSend := fn.Map(
@@ -1696,6 +1696,7 @@ func (d *AuthenticatedGossiper) processChanPolicyUpdate(
 		// that we shouldn't skip any peers when sending this message.
 		chanUpdates = append(chanUpdates, networkMsg{
 			source:   d.selfKey,
+			isRemote: false,
 			msg:      chanUpdate,
 		})
 	}
@@ -2267,6 +2268,7 @@ func (d *AuthenticatedGossiper) handleNodeAnnouncement(nMsg *networkMsg,
 	if isPublic {
 		announcements = append(announcements, networkMsg{
 			peer:     nMsg.peer,
+			isRemote: nMsg.isRemote,
 			source:   nMsg.source,
 			msg:      nodeAnn,
 		})
@@ -2545,6 +2547,7 @@ func (d *AuthenticatedGossiper) handleChanAnnouncement(nMsg *networkMsg,
 	if proof != nil {
 		announcements = append(announcements, networkMsg{
 			peer:     nMsg.peer,
+			isRemote: nMsg.isRemote,
 			source:   nMsg.source,
 			msg:      ann,
 		})
@@ -2934,6 +2937,7 @@ func (d *AuthenticatedGossiper) handleChanUpdate(nMsg *networkMsg,
 		announcements = append(announcements, networkMsg{
 			peer:     nMsg.peer,
 			source:   nMsg.source,
+			isRemote: nMsg.isRemote,
 			msg:      upd,
 		})
 	}

discovery/gossiper_test.go

@@ -824,6 +824,8 @@ func TestProcessAnnouncement(t *testing.T) {
 	require.NoError(t, err, "can't create context")
 
 	assertSenderExistence := func(sender *btcec.PublicKey, msg msgWithSenders) {
+		t.Helper()
+
 		if _, ok := msg.senders[route.NewVertex(sender)]; !ok {
 			t.Fatalf("sender=%x not present in %v",
 				sender.SerializeCompressed(), spew.Sdump(msg))